Emails and Attachments 
Calendars and Contacts
Shared Mailboxes
OneDrive Files*
SharePoint Files within Document Libraries**
Archived Mailboxes 

In-Place Hold / Litigation Hold items

Shared Folders 
Public Folders 
Microsoft Teams

* We only backup files and folders within OneDrive accounts

** We only backup files and folders within SharePoint Sites & Teams Sites.

Altaro Office 365 Backup does not support backing up the following items (list is not exhaustive): Conversation History, Drafts, Hidden Folders, Junk Email, Notes, Outbox, Recoverable items (permanently deleted email folders), Sync Issues, Yammer, Microsoft Booking Items, Microsoft OneNote Items, Microsoft Teams, Contact groups, Items in OneDrive Recycle Bin, SharePoint customisations, SharePoint Public Sites, SharePoint Apps from SharePoint Store and malware flagged items.